Discussion
An aircraft has its centre of gravity at \( 25 \) per cent MAC and a neutral point at \( 38 \) per cent. Its static margin is
Answer: C
Correct answer: 13 per cent
The static margin is the distance from the centre of gravity to the neutral point, expressed as a fraction of the mean aerodynamic chord: \[ 38 - 25 = 13\ \text{per cent MAC.} \] A positive margin means the centre of gravity is ahead of the neutral point, which is the condition for static longitudinal stability - the aircraft returns towards its trimmed attitude after a disturbance.
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